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You are viewing an outdated report. The latest version of this report was published on June 1st, 2019

DNS Site Operator
February 1st, 2018

This report details the names and locations of all DNS servers on the internet, as well as the number of domains that are serviced by these servers. In this fashion, we can discover

  • the number of sites hosted by ISPs
  • the number of sites hosted by hosting companies that use an ISP's facilities, but run their own name servers
  • the number of sites hosted by specialty DNS service providers
  • the organizations that choose to operate their own DNS servers rather than to use those of their ISP/hosting provider.

The survey works by determining each month the authoritative name server for each host (and more accurately, each domain) in our survey. We then count the number of domains hosted on each DNS server.

Curious about the size of a the domain set handled by a particular ISP's name servers? Try searching for the ISP's name server. For example, to find Exodus' name servers, try


Top 20 by Host Name
The top 20 name servers ranked according to the number of domains handled by each name server, with a name server uniquely identified by its fully qualifed name, are shown below.

Name Server Name   Name Server IP   Domains
ns1.bluehost.com  405,535
ns2.bluehost.com  405,522
f1g1ns2.dnspod.net  329,702
f1g1ns1.dnspod.net  329,334
ns1.dreamhost.com  311,346
ns2.dreamhost.com  311,337
ns3.dreamhost.com  311,090
dns2.technorail.com  304,490
dns.technorail.com  304,489
dns3.arubadns.net  304,364
dns4.arubadns.cz  304,363
ns02.one.com  266,855
ns01.one.com  266,855
ns2.dns.ne.jp  237,500
ns1.dns.ne.jp  237,493
ns.namespace4you.de  226,857
ns2.namespace4you.de  226,852
ns5.kasserver.com  219,041
ns6.kasserver.com  219,012
dns1.name-services.com  188,178

Survey Limitations
Our survey, while having an impressive 85,417,855 sites and 31,492,048 domains in the data set, does not include all web sites and domains. We only include those that we consider active, which, by our definition, means we found the site via a link from somewhere else. Sites not linked by anyone are by definition not included in the survey.

We also actively drop sites out of the survey that fail to respond 3 consecutive months to our HTTP queries. So, while a DNS server might still respond with information for a domain, if there is no active web site that we can reach for the domain in question, then the domain is not included in this survey at all, even if it still has other functioning services (such as email).

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